memory-barriers.txt: Fix broken link to atomic_ops.txt

Few obsolete links to atomic_ops.txt exist in memory-barriers.txt though
the file has moved to core-api/atomic_ops.rst.  This commit fixes the
obsolete links.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
SeongJae Park 2017-07-07 03:21:17 +09:00 • committed by Jonathan Corbet
commit 3afadfd902